I think the Viper 8x42 and the Fujinon 7x50 are so distinctly different devices that one should really consider if the change is justified. Is like if you go from a light and zippy english convertible to a heavy 4x4. Both can offer great performance, but are simply made to fulfill different purposes. I had the Fujinon and they are really a delight, especially under the night sky, the stars are pinpoint and the view is more immersive than what the humble FOV figure would suggest. However they are VERY heavy. I mean... Fred Flinstone heavy. Not joking. They are a beast, that might or might not be to your liking. I think I can concurre with some of the suggestions to get a nice-but-not-so-expensive porro, wether 7x50 or 10x50. You can find very nice value in brands like APM or Orion. As a matter of fact, the APM "copy" of the Fujinon has received a lot of praise. Or otherwise, there are dedicated astro 7x50 and 10x50 with IF at different price points. Since you have the Viper, and it has a stellar warranty and has served you well, I'd definitely keep it and would look to get another "astro only" binocular. Once you get it, you can compare both. And If, after a while, you realise you don't use the Viper at all, you can always sell it.